261939600939743 has 8 divisors (see below), whose sum is σ = 264533394761856. Its totient is φ = 259345813636000.

The previous prime is 261939600939649. The next prime is 261939600939763. The reversal of 261939600939743 is 347939006939162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261939600939743 is a prime.

It is a super-2 number, since 2×261939600939743² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261939600939763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138506738 + ... + 140385168.

It is an arithmetic number, because the mean of its divisors is an integer number (33066674345232).

Almost surely, 2^{261939600939743} is an apocalyptic number.

261939600939743 is a deficient number, since it is larger than the sum of its proper divisors (2593793822113).

261939600939743 is a wasteful number, since it uses less digits than its factorization.

261939600939743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259185.

The product of its (nonzero) digits is 357128352, while the sum is 71.

The spelling of 261939600939743 in words is "two hundred sixty-one trillion, nine hundred thirty-nine billion, six hundred million, nine hundred thirty-nine thousand, seven hundred forty-three".